PRESSURE-DEPENDENT SOLVENT-INDUCED SHIFTS IN MOLECULAR VIBRATIONAL FREQUENCIES

Solvent-induced vibrational frequency shifts are calculated for diatom ic oscillators immersed in a solvent, using 'Hard-Fluid' model, This t reatment is applied to homonuclear diatomic solutions, such as nitroge n, hydrogen, chlorine, etc, in different solvents such as carbon tetra chloride, methanol, toluene etc, in different packing fractions. The c orresponding packing fractions are in the range 0.05-0.5. The repulsiv e and the attractive part of the molecular vibrational frequency shift s have been calculated, The repulsive contribution is calculated from the pair distribution function for hard-sphere cavities. The attractiv e part have been calculated from various solute parameters, The calcul ated results are compared with the experimental ones for certain cases and found to be satisfactory.